314 lines
8.3 KiB
Diff
314 lines
8.3 KiB
Diff
--- a/drivers/watchdog/rdc321x_wdt.c
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+++ b/drivers/watchdog/rdc321x_wdt.c
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@@ -36,111 +36,99 @@
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#include <linux/watchdog.h>
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#include <linux/io.h>
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#include <linux/uaccess.h>
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+#include <linux/pci.h>
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+#include <linux/delay.h>
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#include <linux/mfd/rdc321x.h>
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-#define RDC_WDT_MASK 0x80000000 /* Mask */
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+#define RDC321X_WDT_REG 0x00000044
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+
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#define RDC_WDT_EN 0x00800000 /* Enable bit */
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-#define RDC_WDT_WTI 0x00200000 /* Generate CPU reset/NMI/WDT on timeout */
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-#define RDC_WDT_RST 0x00100000 /* Reset bit */
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-#define RDC_WDT_WIF 0x00040000 /* WDT IRQ Flag */
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-#define RDC_WDT_IRT 0x00000100 /* IRQ Routing table */
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-#define RDC_WDT_CNT 0x00000001 /* WDT count */
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+#define RDC_WDT_WDTIRQ 0x00400000 /* Create WDT IRQ before CPU reset */
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+#define RDC_WDT_NMIIRQ 0x00200000 /* Create NMI IRQ before CPU reset */
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+#define RDC_WDT_RST 0x00100000 /* Reset wdt */
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+#define RDC_WDT_NIF 0x00080000 /* NMI interrupt occured */
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+#define RDC_WDT_WIF 0x00040000 /* WDT interrupt occured */
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+#define RDC_WDT_IRT 0x00000700 /* IRQ Routing table */
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+#define RDC_WDT_CNT 0x0000007F /* WDT count */
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-#define RDC_CLS_TMR 0x80003844 /* Clear timer */
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+/* default counter value (2.34 s) */
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+#define RDC_WDT_DFLT_CNT 0x00000040
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-#define RDC_WDT_INTERVAL (HZ/10+1)
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+#define RDC_WDT_SETUP (RDC_WDT_EN | RDC_WDT_NMIIRQ | RDC_WDT_RST | RDC_WDT_DFLT_CNT)
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static int ticks = 1000;
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/* some device data */
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static struct {
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- struct completion stop;
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- int running;
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struct timer_list timer;
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- int queue;
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- int default_ticks;
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- unsigned long inuse;
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- spinlock_t lock;
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+ int seconds_left;
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+ int total_seconds;
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+ bool inuse;
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+ bool running;
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+ bool close_expected;
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+
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struct pci_dev *sb_pdev;
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int base_reg;
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} rdc321x_wdt_device;
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-/* generic helper functions */
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+static struct watchdog_info ident = {
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+ .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
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+ .identity = "RDC321x WDT",
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+};
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+
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-static void rdc321x_wdt_trigger(unsigned long unused)
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+/* generic helper functions */
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+static void rdc321x_wdt_timer(unsigned long unused)
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{
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- unsigned long flags;
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- u32 val;
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+ if (!rdc321x_wdt_device.running) {
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+ pci_write_config_dword(rdc321x_wdt_device.sb_pdev,
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+ rdc321x_wdt_device.base_reg, 0);
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+ return;
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+ }
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- if (rdc321x_wdt_device.running)
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- ticks--;
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+ rdc321x_wdt_device.seconds_left--;
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- /* keep watchdog alive */
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- spin_lock_irqsave(&rdc321x_wdt_device.lock, flags);
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- pci_read_config_dword(rdc321x_wdt_device.sb_pdev,
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- rdc321x_wdt_device.base_reg, &val);
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- val |= RDC_WDT_EN;
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- pci_write_config_dword(rdc321x_wdt_device.sb_pdev,
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- rdc321x_wdt_device.base_reg, val);
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- spin_unlock_irqrestore(&rdc321x_wdt_device.lock, flags);
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+ if (rdc321x_wdt_device.seconds_left < 1)
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+ return;
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- /* requeue?? */
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- if (rdc321x_wdt_device.queue && ticks)
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- mod_timer(&rdc321x_wdt_device.timer,
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- jiffies + RDC_WDT_INTERVAL);
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- else {
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- /* ticks doesn't matter anyway */
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- complete(&rdc321x_wdt_device.stop);
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- }
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+ pci_write_config_dword(rdc321x_wdt_device.sb_pdev,
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+ rdc321x_wdt_device.base_reg, RDC_WDT_SETUP);
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+ mod_timer(&rdc321x_wdt_device.timer, HZ * 2 + jiffies);
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}
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static void rdc321x_wdt_reset(void)
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{
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- ticks = rdc321x_wdt_device.default_ticks;
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+ rdc321x_wdt_device.seconds_left = rdc321x_wdt_device.total_seconds;
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}
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static void rdc321x_wdt_start(void)
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{
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- unsigned long flags;
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-
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- if (!rdc321x_wdt_device.queue) {
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- rdc321x_wdt_device.queue = 1;
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-
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- /* Clear the timer */
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- spin_lock_irqsave(&rdc321x_wdt_device.lock, flags);
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- pci_write_config_dword(rdc321x_wdt_device.sb_pdev,
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- rdc321x_wdt_device.base_reg, RDC_CLS_TMR);
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-
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- /* Enable watchdog and set the timeout to 81.92 us */
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- pci_write_config_dword(rdc321x_wdt_device.sb_pdev,
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- rdc321x_wdt_device.base_reg,
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- RDC_WDT_EN | RDC_WDT_CNT);
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- spin_unlock_irqrestore(&rdc321x_wdt_device.lock, flags);
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+ if (rdc321x_wdt_device.running)
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+ return;
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- mod_timer(&rdc321x_wdt_device.timer,
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- jiffies + RDC_WDT_INTERVAL);
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- }
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+ rdc321x_wdt_device.seconds_left = rdc321x_wdt_device.total_seconds;
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+ rdc321x_wdt_device.running = true;
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+ rdc321x_wdt_timer(0);
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- /* if process dies, counter is not decremented */
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- rdc321x_wdt_device.running++;
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+ return;
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}
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static int rdc321x_wdt_stop(void)
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{
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- if (rdc321x_wdt_device.running)
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- rdc321x_wdt_device.running = 0;
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+ if (WATCHDOG_NOWAYOUT)
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+ return -ENOSYS;
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- ticks = rdc321x_wdt_device.default_ticks;
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+ rdc321x_wdt_device.running = false;
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- return -EIO;
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+ return 0;
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}
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/* filesystem operations */
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static int rdc321x_wdt_open(struct inode *inode, struct file *file)
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{
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- if (test_and_set_bit(0, &rdc321x_wdt_device.inuse))
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+ if (xchg(&rdc321x_wdt_device.inuse, true))
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return -EBUSY;
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return nonseekable_open(inode, file);
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@@ -148,7 +136,16 @@ static int rdc321x_wdt_open(struct inode
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static int rdc321x_wdt_release(struct inode *inode, struct file *file)
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{
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- clear_bit(0, &rdc321x_wdt_device.inuse);
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+ int ret;
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+
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+ if (rdc321x_wdt_device.close_expected) {
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+ ret = rdc321x_wdt_stop();
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+ if (ret)
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+ return ret;
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+ }
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+
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+ rdc321x_wdt_device.inuse = false;
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+
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return 0;
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}
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@@ -156,30 +153,29 @@ static long rdc321x_wdt_ioctl(struct fil
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unsigned long arg)
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{
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void __user *argp = (void __user *)arg;
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- u32 value;
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- static struct watchdog_info ident = {
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- .options = WDIOF_CARDRESET,
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- .identity = "RDC321x WDT",
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- };
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- unsigned long flags;
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+ int value;
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switch (cmd) {
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case WDIOC_KEEPALIVE:
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rdc321x_wdt_reset();
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break;
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- case WDIOC_GETSTATUS:
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- /* Read the value from the DATA register */
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- spin_lock_irqsave(&rdc321x_wdt_device.lock, flags);
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- pci_read_config_dword(rdc321x_wdt_device.sb_pdev,
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- rdc321x_wdt_device.base_reg, &value);
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- spin_unlock_irqrestore(&rdc321x_wdt_device.lock, flags);
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- if (copy_to_user(argp, &value, sizeof(u32)))
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- return -EFAULT;
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- break;
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case WDIOC_GETSUPPORT:
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if (copy_to_user(argp, &ident, sizeof(ident)))
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return -EFAULT;
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break;
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+ case WDIOC_SETTIMEOUT:
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+ if (copy_from_user(&rdc321x_wdt_device.total_seconds, argp, sizeof(int)))
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+ return -EFAULT;
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+ rdc321x_wdt_device.seconds_left = rdc321x_wdt_device.total_seconds;
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+ break;
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+ case WDIOC_GETTIMEOUT:
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+ if (copy_to_user(argp, &rdc321x_wdt_device.total_seconds, sizeof(int)))
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+ return -EFAULT;
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+ break;
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+ case WDIOC_GETTIMELEFT:
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+ if (copy_to_user(argp, &rdc321x_wdt_device.seconds_left, sizeof(int)))
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+ return -EFAULT;
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+ break;
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case WDIOC_SETOPTIONS:
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if (copy_from_user(&value, argp, sizeof(int)))
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return -EFAULT;
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@@ -194,17 +190,34 @@ static long rdc321x_wdt_ioctl(struct fil
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}
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break;
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default:
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- return -ENOTTY;
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+ return -EINVAL;
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}
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+
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return 0;
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}
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static ssize_t rdc321x_wdt_write(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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+ size_t i;
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+
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if (!count)
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return -EIO;
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+ rdc321x_wdt_device.close_expected = false;
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+
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+ for (i = 0; i != count; i++) {
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+ char c;
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+
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+ if (get_user(c, buf + i))
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+ return -EFAULT;
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+
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+ if (c == 'V') {
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+ rdc321x_wdt_device.close_expected = true;
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+ break;
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+ }
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+ }
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+
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rdc321x_wdt_reset();
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return count;
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@@ -246,27 +259,18 @@ static int __devinit rdc321x_wdt_probe(s
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rdc321x_wdt_device.sb_pdev = pdata->sb_pdev;
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rdc321x_wdt_device.base_reg = r->start;
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+ rdc321x_wdt_device.running = false;
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+ rdc321x_wdt_device.close_expected = false;
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+ rdc321x_wdt_device.inuse = 0;
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+ setup_timer(&rdc321x_wdt_device.timer, rdc321x_wdt_timer, 0);
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+ rdc321x_wdt_device.total_seconds = 100;
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+
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err = misc_register(&rdc321x_wdt_misc);
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if (err < 0) {
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dev_err(&pdev->dev, "misc_register failed\n");
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return err;
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}
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- spin_lock_init(&rdc321x_wdt_device.lock);
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-
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- /* Reset the watchdog */
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- pci_write_config_dword(rdc321x_wdt_device.sb_pdev,
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- rdc321x_wdt_device.base_reg, RDC_WDT_RST);
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-
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- init_completion(&rdc321x_wdt_device.stop);
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- rdc321x_wdt_device.queue = 0;
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-
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- clear_bit(0, &rdc321x_wdt_device.inuse);
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-
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- setup_timer(&rdc321x_wdt_device.timer, rdc321x_wdt_trigger, 0);
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-
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- rdc321x_wdt_device.default_ticks = ticks;
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-
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dev_info(&pdev->dev, "watchdog init success\n");
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return 0;
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@@ -274,10 +278,11 @@ static int __devinit rdc321x_wdt_probe(s
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static int __devexit rdc321x_wdt_remove(struct platform_device *pdev)
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{
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- if (rdc321x_wdt_device.queue) {
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- rdc321x_wdt_device.queue = 0;
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- wait_for_completion(&rdc321x_wdt_device.stop);
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- }
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+ if (rdc321x_wdt_device.inuse)
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+ rdc321x_wdt_device.inuse = 0;
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+
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+ while (timer_pending(&rdc321x_wdt_device.timer))
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+ msleep(100);
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misc_deregister(&rdc321x_wdt_misc);
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